| To know what you know and what you do not know, that is true knowledge. |
| Success depends upon previous preparation, and without such preparation there is sure to be failure. |
| When it is obvious that the goals cannot be reached, don't adjust the goals, adjust the action steps. |
| Do not impose on others what you yourself do not desire. |
| The father who does not teach his son his duties is equally guilty with the son who neglects them. |
| Life is really simple, but we insist on making it complicated. |
| They must often change who would be constant in happiness or wisdom. |
| Real knowledge is to know the extent of one's ignorance. |
| When it is obvious that the goals cannot be reached, don't adjust the goals, adjust the action steps. |
| Humility is the solid foundation of all virtues. |
